Riveting tool



Nov. 24, 1936.

L. P. KAMOSIS RIVETING TOOL Filed Dec. 2, 1935 INVENTOR.

ATTORNEY. 7

Patented Nov. 24, 1936 hearse stares ATENT OFFICE 1 Claim.

This invention relates to riveting tools and the object of the invention is to provide a tool for forming heads on rivets and particularly adapted for use in heading over the ends of hot rivets.

Another object of the invention is to provide a riveting tool having a head portion which is yieldably held in the remainder of the tool and is arranged to prevent the transfer of the shocks of riveting through the tool to the person of the user.

Another object of the invention is to provide a riveting tool in which the head may be easily removed or replaced to allow repair or replacement of the spring on which the shoulder piece is supported.

A further object of the invention is to provide a riveting tool having a shoulder piece which is slidable longitudinally of the tool and limited in its outward movement by means of a threaded stop pin and yieldably resisted in its inward movement by means of a coiled spring enclosed within the tool body.

A further object of the invention is to provide a riveting tool of the character described in which the riveting head may be removed and replaced with any type of head suitable for the work to be performed.

These objects and the several novel features of the invention are hereinafter more fully de- 30 scribed and claimed and the preferred form of construction by which these objects are attained is shown in the accompanying drawing in which- Fig. l is an elevation of a riveting tool embodying my invention.

35 Fig. 2 is a longitudinal section therethrough taken on line 2-2 of Fig. 1.

Fig. 3 is a section taken on line 3-3 of Fig. 2.

The device comprises a body I shown more particularly in Fig. 2 having a threaded extension 2 40 at the lower end. This threaded extension is so arranged that different types of riveting heads may be threaded thereon. One form of riveting head is shown in Figs. 1 and 2 comprising a cylindrical member 3 which is threaded onto the 45 extension 2 and is provided with an annular shoulder l arranged to engage tightly against the annular shoulder 5 of the body I when the head 3 is threaded up tight. The head 3 is provided with an enlarged recess 6 of greater diameter 50 than the threaded end 2 to allow proper seating engagement between the annular shoulders 4 and 5. At the lower end the head may be shaped for the particular type or form of rivet with which the device is used. The head shown in the draw- 55 ing is provided with a frustro-conical lower end I which is provided with a recess 26 in the ex-- treme lower end shaped to fit over the rivet head with which the device is to be used.

The body I of the device is provided with a recess 8 in the upper end having a shoulder 9 and 5 provided with a continuing recess 50 of smaller diameter beneath the shoulder 9. The plunger II is provided with a collar I2 shown in Figs. 2 and 3 and a coiled spring I3 is positioned between the collar I2 and the shoulder 9 at the bottom 10 of the recess 8. The plunger II is provided with an elongated slot I4 and a pin I5 extends through this slot and is journaled in one side of the body flange I6 while the opposite end of the pin I5 is provided with a threaded enlargement 15 I! which is threaded into the body flange I6 to hold the pin in position.

The coiled spring I3 is fairly stiff and urges the plunger I I upwardly in relation to the body I so that the bottom of the slot I4 engages the pin 20 I5, as shown in Figs. 2 and 3. When in this position shown in Fig. 2, the lower end of the plunger II is spaced from the bottom I8 of the recess I6 and this space between the lower end of the plunger II and the bottom I8 of the recess is slightly less than the distance between the upper side of the pin I5 and the top of the slot I4. Consequently, when the body I and pin I5 is moved upwardly in relation to the plunger I I the bottom of the plunger II will strike the bottom l8 of the recess In just before the top of the slot I4 strikes the upper side of the pin I5, thus preventing any strain being placed on the pin I5 when the device is being used to head a rivet.

In operation, the device is held in the hands and the recess 20 in the end I of the head 3 is positioned over the head of the rivet. At the same time, the operator positions his shoulder against the enlarged end I!) of the plunger and the riveting hammer is applied to the opposite end of the rivet. During this pounding of the rivet with the riveting hammer, the inertia of the body I and head 3 absorbs a major portion of each hammer blow and pressure is applied against the enlarged end I9 of the plunger with the shoulder. This causes the plunger to float in the device so that the pin I5 is positioned between the top and bottom of the slot I4 and the spring I3 at this time absorbs the remaining shock not absorbed by the inertia of the body to prevent communication of the hammer blows to the body of the user.

If the hammer blows become too hard and the spring I3 is further compressed, the lower end of the plunger I I will strike the bottom I8 of the recess I0 and prevent shearing of the pin I5 by the plunger, though the spring l3 should be so designed as to normally prevent the plunger H from striking the bottom l8 of the recess l0. By providing a screw end I! on the pin I5, this pin may be readily removed to allow replacement of the coiled spring l3 should it become broken or allow replacement of the plunger and pin when necessary.

From the foregoing description it becomes evident that the device is very simple and efficient in operation, will not easily get out of order, may be provided with different style heads for riveting and provides a device which accomplishes the objects described.

Having thus fully described my invention, its utility and mode of operation, what I claim and desire to secure by Letters Patent of the United States is In a riveting tool, a head, a body portion, means connecting the head and body portions, the body portion being provided with a recess in the end opposite the head, said recess being provided with a continuation of smaller diameter, an annular transverse shoulder between the recess portions of smaller and larger diameter, a pin extending through the head diametrically across the larger portion of therecess, one end of the pin being journaled in one side of the body portion and the other end of the pin being threaded into the other side of the body portion to allow the parts to be disassembled, a plunger provided with a slot therethrough, said pin extending through the slot and the slot being of sufficient width to allow longitudinal movement of the plunger on the pin, an annular flange on the plunger beneath the pin, a coiled spring positioned about the plunger between the annular flange and the annular shoulder in the body portion, the plunger terminating above the bottom of the smaller recess portion and the spring urging the plunger outwardly to engage the bottom of the slot therein against the pin, the arrangement being such that the distance between the pin and the top of the plunger slot is slightly greater than the distance between the bottom of the plunger and the bottom of the smaller recess portion.

LOUIS P. KAMOSIS. 

